宽带雷达中频直接采样与高速存储系统设计与实现

该文针对大瞬时带宽的宽带雷达回波信号中频直接采样需要解决的采样速率和高速海量数据实时连续存储等问题，首先根据带通信号无混叠采样条件确定了系统的采样速率，并依此提出了数字正交解调、缓存与高速实时无丢失存储等方案并进行了设计与实现。研制的中频信号高速采集实时存储系统基于机架服务器平台，采用QDRII SRAM 作为缓存，以PCIe 接口为数据传输通道。系统在某相控阵雷达实验平台中得到应用，通过外场实测，性能良好，为宽带雷达回波中频直接采集提供一种可行的实现方法。 

Design and Implementation of Direct IF Sampling and High-speed Storage System for Wideband Radar

To resolve the problem of sampling speed and real-time continuous mass storage in large instantaneous bandwidth radar signal direct Intermediate Frequency (IF) sampling, a wideband radar intermediate frequency signal acquisition and real-time storage system is developed in this paper. Firstly, according to bandpass signals alias-free sampling theorem, the sampling frequency is determined. And then the digital quadrature demodulation, buffer and high speed real-time continuous mass storage design scheme is proposed. Based on chassis server platform, this system uses QDRII SRAM as the buffer storage, and adopts PCIe to be the data transmission channel. It is verified in a phased array radar experimental system that this system makes a good performance and gives a feasible schema for wideband radar data acquisition.